Abu Dhabi: A history-making third century in a row to Younis Khan, and one to Azhar Ali, guided the hosts to 304 for 2 at stumps on Thursday.
Since opening this Test series with a burst that had Pakistan at 2-7 after 19 balls, Pakistan have racked up 1,057 runs for the loss of 12 wickets in 311 overs.
Younis has now scored 320 runs in this two-Test series. He was joined at stumps by Azhar Ali who overcame back spasms to post a century of his own to be 101 not out, with the pair enjoying an unbeaten 208-run stand.
Younis's century did not come without the odd slice of luck. He should have been run out attempting a fourth run in the nineties after a determined bit of fielding on the boundary from Chris Rogers, but wicketkeeper Brad Haddin, with his gloves off and standing in front of the stumps, failed to take the throw.
Azhar had several lives of his own, dropped by two of Australia's better fielders in Steven Smith and David Warner.
Neither chance was straightforward, but each was the sort of catchable opportunity a team that has lost the toss needs to take.
Smith could not react quickly enough to take a catch at short-leg when Azhar played Lyon to the leg-side. And Warner did his best with a spectacular flying leap to his right when Smith's leg-spinners fizzed off the shoulder of the bat wide at slip.
Mitchell Johnson (1-50) and Nathan Lyon (1-86) were the only bowlers to score breakthroughs on a difficult day where the over-rate was sluggish.
Johnson collected Mohammed Hafeez (45) in the only second session wicket to fall, a simple catch behind for Haddin as Australia's spearhead found some nice shape away from the right-hander.
In the first session Lyon had opener Ahmed Shehzad (35) trapped in front in his third over.
Earlier, Pakistan have won the toss and opted to bat.
Pakistan have unchanged while a couple of changes in Australia squad -- Steve O'Keefe and Alex Doolan have been dropped. Glenn Maxwell and Mitchell Starc have replaced.
Pakistan: Ahmed Shehzad, Mohammad Hafeez, Azhar Ali, Younis Khan, Misbah-ul-Haq (Captain), Asad Shafiq, Sarfraz Ahmed (wk), Zulfiqar Babar, Yasir Shah, Rahat Ali, Imran Khan
Australia: David Warner, Chris Rogers, Glenn Maxwell, Michael Clarke (Captain), Steven Smith, Mitchell Marsh, Brad Haddin (wk), Mitchell Johnson, Peter Siddle, Mitchell Starc, Nathan Lyon
Pakistan - 304/2 (Younis Khan 111*, Azhar Ali 101*)